Fireproof and wood-preserving paint.



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1 UNITED STATES PATENT OFFICE.

JAMES W. GRIMIES, OF SPRINGFIELD, OHIO, ASSIGNOB OF ONE-HALF TO CHARLES D.

' I RAWSON, OF DES MOINES, IOWA.

FIRET'ROOF AND WOOD-PRESERVING PAINT.

1,113,782. Specification of Letters Patent. Patented Oct 13, 1914,

No Drawing. Application filed February 24, 1913. Sei iarNo.751,148.

To all tohom it may concern: I pounds of powdered copper sulfate, and

Be it known that I, JAMES W. G RIMES, four gallons of coal tar, which ingredients 50 a citizen of the United States,'res1d1ng at are treated asfollows: They are placed in Springfield, in the I county of Clark and a vessel which should be at least twice as 5 State of Ohio, have invented a certaln new large in capacity as the bulk of the ingrediand useful Fireproof and Wood-Preservents when first placed therein. Then heat mg Paint, of which the following is a speciis applied to the vessel and the compound 55 ficatlon. I I I I ls boiled. During the boiling the mass is The ob ect of my invention 1s to provide stirred. After being boiled for a short pean improved chemical product consisting of riod, the mass will greatly increase in size is further to provide a mixed subsulfids of copper and lead and tar residue that will have, when heated to a certain degree, the consistency of ordinary paint, and that may be applied with a brush to wood for the purpose of making it fire proof and for preserving it; and my object f this kind composed of simple and inexpensive ingredients'readily obtainable in any locality, and a treatment or process for said ingredients which may be readily and easily carried on, whereby the resultant product is obtained.

My invention consists in the combination of certainchemical substances, whereby the objects contemplated are attained, as hereinafter more fully set forth, and pointed out in my claims.

My improved paint comprises mixed sulfids of copper, mixed sulfids of lead, and tar residue. The exact proportions of said various elements have not yet been fully determined by me. The result of an analysis, made by a skilled chemistof my improved paint is as follows:

Free or uncombined sulfur: 1.10% Lead oxid PbO, (unchanged) 1.26

Copper sulfate None Mixed sulfids of copper, computed as cuprous sulfid, Cu S 1.48 Mixed sulfids of lead, computed as PbS 4.76 Sulfur dioxld. evolved in process of manufacture 2.10 Carbon disulfld, evolved in manufacture 1.05 Water, evolved in process of manufacture 1.92 Tar, residue I 86.30

and during thistime while boiling the mass will assume a reddish brown color. ing the period while this mass is of a reddish brown color, it is highly inflammable and care should be taken that it does not overflow on the fire and that the gases arising from it do not come in contact with the flame. Shortly after the mass has assumed the reddish brown appearance, it will begin to decrease in quantity in the vessel and will I assume a black appearance. After the mass has fallen to about its original size and has 7 0 assumed the black appearance, it will heat-resisting and cannot be burned under ordinary conditions. In this condition it, is ready for use and whenapplied to wood surfaces or combustible material will pro- II tect the wood from burning. The material should be applied to wood or other surfaces while hot and after it has been heated andcooled, it may be repeatedly reheated. I claim as my invention: I 1. An improved fire proof and preservative paint, comprising mixed sulfids of copper,

- mixed sulfids of lead, and tar residue.

2. An improved fire proof and preservative paint, comprising mixed sulfids of copper, mlxed sulfids of lead, and tar residue formed by boiling sulfur sublimate, lead oxid, copper sulfate, and coal tar in about the proportions stated, and in the manner described.

Springfield, Ohio, Feb. 13, 1913.

JAMES W. GRIMES.

Vitnesses:

A. C. LINK, HELEN M. RUNYAN.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents,

Washington, D. C.

Dur- 60 

